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Updated: Thursday, June 13, 2019

Cwd (3)


Cwd - get pathname of current working directory


use Cwd;
my $dir = getcwd;

use Cwd 'abs_path';
my $abs_path = abs_path($file);


Perl Programmers Reference Guide                                        Cwd(3)

       Cwd - get pathname of current working directory

           use Cwd;
           my $dir = getcwd;

           use Cwd 'abs_path';
           my $abs_path = abs_path($file);

       This module provides functions for determining the pathname of the
       current working directory.  It is recommended that getcwd (or another
       *cwd() function) be used in all code to ensure portability.

       By default, it exports the functions cwd(), getcwd(), fastcwd(), and
       fastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace.

   getcwd and friends
       Each of these functions are called without arguments and return the
       absolute path of the current working directory.

               my $cwd = getcwd();

           Returns the current working directory.

           Exposes the POSIX function getcwd(3) or re-implements it if it's
           not available.

               my $cwd = cwd();

           The cwd() is the most natural form for the current architecture.
           For most systems it is identical to `pwd` (but without the trailing
           line terminator).

               my $cwd = fastcwd();

           A more dangerous version of getcwd(), but potentially faster.

           It might conceivably chdir() you out of a directory that it can't
           chdir() you back into.  If fastcwd encounters a problem it will
           return undef but will probably leave you in a different directory.
           For a measure of extra security, if everything appears to have
           worked, the fastcwd() function will check that it leaves you in the
           same directory that it started in.  If it has changed it will "die"
           with the message "Unstable directory path, current directory
           changed unexpectedly".  That should never happen.

             my $cwd = fastgetcwd();

           The fastgetcwd() function is provided as a synonym for cwd().

               my $cwd = getdcwd();
               my $cwd = getdcwd('C:');

           The getdcwd() function is also provided on Win32 to get the current
           working directory on the specified drive, since Windows maintains a
           separate current working directory for each drive.  If no drive is
           specified then the current drive is assumed.

           This function simply calls the Microsoft C library _getdcwd()

   abs_path and friends
       These functions are exported only on request.  They each take a single
       argument and return the absolute pathname for it.  If no argument is
       given they'll use the current working directory.

             my $abs_path = abs_path($file);

           Uses the same algorithm as getcwd().  Symbolic links and relative-
           path components ("." and "..") are resolved to return the canonical
           pathname, just like realpath(3).

             my $abs_path = realpath($file);

           A synonym for abs_path().

             my $abs_path = fast_abs_path($file);

           A more dangerous, but potentially faster version of abs_path.

       If you ask to override your chdir() built-in function,

         use Cwd qw(chdir);

       then your PWD environment variable will be kept up to date.  Note that
       it will only be kept up to date if all packages which use chdir import
       it from Cwd.

       See attributes(7) for descriptions of the following attributes:

       |Availability   | runtime/perl-526      |
       |Stability      | Pass-through volatile |
       o   Since the path separators are different on some operating systems
           ('/' on Unix, ':' on MacPerl, etc...) we recommend you use the
           File::Spec modules wherever portability is a concern.

       o   Actually, on Mac OS, the "getcwd()", "fastgetcwd()" and "fastcwd()"
           functions are all aliases for the "cwd()" function, which, on Mac
           OS, calls `pwd`.  Likewise, the "abs_path()" function is an alias
           for "fast_abs_path()".

       Originally by the perl5-porters.

       Maintained by Ken Williams <KWILLIAMS@cpan.org>

       Copyright (c) 2004 by the Perl 5 Porters.  All rights reserved.

       This program is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself.

       Portions of the C code in this library are copyright (c) 1994 by the
       Regents of the University of California.  All rights reserved.  The
       license on this code is compatible with the licensing of the rest of
       the distribution - please see the source code in Cwd.xs for the


       This software was built from source available at
       https://github.com/oracle/solaris-userland.  The original community
       source was downloaded from

       Further information about this software can be found on the open source
       community website at http://www.perl.org/.

perl v5.26.3                      2018-03-23                            Cwd(3)